200 BULLETIN OF THE 
cut Academy of Arts and Sciences, Vols. V. and VI., 1882-1885), and 
Mr. Dall’s reports on the “ Blake” Mollusca (this Bulletin, Vols, IX., 
XII., and XVIII, 1881, 1886, and 1889). In some instances, where 
the name has been changed, a more complete synonymy is given.* 
In order that the distribution of each species may be given as com- 
pletely as possible, the range, as recorded in the Reports of the U. S. 
Commission of Fish and Fisheries, is included, and mention is also made 
of other known localities, north and south. 
In giving the bathymetrical range, mention in most cases is made 
of the depths at which the species was found living, in addition to the 
extreme limit of range. When no distinction is made, it is to be under- 
stood that the specimens were taken alive. 
At the end of this report, a list of the species is given, showing the 
relation of each to the Northern and Southern faunas. 
My acknowledgmeuts are especially due to Professor Agassiz for the 
privilege of preparing this paper, and to Professor Verrill for valuable 
advice and criticism. 
* Other books used for reference are the following :— 
Binney, W. G. Gould’s Invertebrata of Massachusetts, 1870. 
Bush, K. J. Report on Labrador Shells, Proceedings of the U. S. National Mu- 
seum, Vol. VI., 1883; Shallow-water Mollusca off Cape Hatteras, Report of the 
Commissioner of Fish and Fisheries for 1883, 1885; and Transactions of the 
Connecticut Academy, Vol. VI., 1885. 
Dall, W. H. Report on Florida Shells, Proceedings of the U.S. National Museum, 
Vol. VI., 1883; Preliminary Report on the Mollusca obtained by the “ Alba- 
tross” in 1887-88, Proceedings of the U. S. National Museum, Vol. XII., 1889; 
Marine Mollusks of the S. E. coast of the United States, Bulletin U. S. Nat. 
Mus., No. 37, 1889; Contributions to the Tertiary Fauna of Florida, Transac- 
tions of the Wagner Free Institute of Science of Philadelphia, Vol. III., 1890. 
Pelseneer, P. Report of the “Challenger,” Zodlogy (Heteropoda and Pteropoda), 
Vol. XXIII., 1888. 
Sars, G.O. Mollusca Regionis Arctice Norvegiz, 1878. 
Verrill, A. E. Invertebrate Animals of Vineyard Sound, 1874; Results of the 
Explorations made by the Steamer “ Albatross” in 1883, Report of the Com- 
missioner of Fish and Fisheries for 1883, 1885. 
Watson, R.B. Mollusca of the “ Challenger” Expedition, Linnean Society’s Jour- 
nal, London, Vol. XV., 1881; Report of the ‘‘ Challenger,” Zoology, Vol. XV., 
1886. 
Whiteaves, J. F. Reports on the Deep-sea Dredgings in the Gulf of St. Lawrence, 
1871-74. 
